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Seagate 6TB Enterprise Capacity 3.5 HDD v4 RAID Analysis

By: Paul Alcorn | RAID/HBA in IT/Datacenter | Posted: Sep 26, 2014 1:10 am
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RAID 0 4k Random Read/Write

 

seagate_6tb_enterprise_capacity_3_5_hdd_v4_raid_analysis_12

 

Each level tested includes 300 data points (five minutes of one second reports) to illustrate performance variability. The line for each OIO depth represents the average speed reported during the five-minute interval. 4k random speed measurements are an important metric when comparing drive performance, as the hardest type of file access for any storage solution to master is small-file random. 4k random performance is a heavily marketed figure, and one of the most sought-after performance specifications.

 

The four-drive array averages 761 IOPS at 256 OIO (Outstanding I/Os). The eight Seagate V4's make the jump up to 1,454 IOPS at 256 OIO - barely shy of providing perfectly linear scaling.

 

seagate_6tb_enterprise_capacity_3_5_hdd_v4_raid_analysis_13

 

Latency performance becomes less consistent as we move from four drives to eight drives in the random read workload.

 

seagate_6tb_enterprise_capacity_3_5_hdd_v4_raid_analysis_14

 

The eight-drive Seagate v4's provide 1,235 IOPS at 256 OIO, a nearly perfect linear scaling from the 646 IOPS provided by the four-drive array.

 

seagate_6tb_enterprise_capacity_3_5_hdd_v4_raid_analysis_15

 

The write latency results also feature a bit more variability as we add more drives.

 

seagate_6tb_enterprise_capacity_3_5_hdd_v4_raid_analysis_16

 

Our write percentage testing illustrates the varying performance of each solution with mixed workloads. The 100% column to the right is a pure 4k write workload, and 0% represents a pure 4k read workload.

 

In mixed workloads, the addition of several drives pays big dividends. In some mixtures, particularly as we mix in more write activity, we observe more than double the performance of the four-drive array.

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